Safety hook



R.K.AHERTEL SAFETY HOOK Filed April 15, 1936 fi/cbara A. Heffel:'INVENTOR.

BY 664M ATTORNEYS.

Patented Apr.- l 1940 I Z onist UNITED STATES PATENT OFFlCE .1

' I 2,196,460 v v d v SAFETY HOOK I Richard K. Hertel, Vernon; Califi,assignor to Byron Jackson 00.; Huntington Park, Califi, a

corporation of Delaware a d Application April 1a, 1936, Serial :No.74.109

5 Clain s. (c1. 294982) This invention relates to safety hooksv such asare used for handling oil well rods Ortubing. More particularly theinvention relates to .improvements in that type of rod hook shown in 5Joseph F. Moody and Virgil L. Du Bois.

vide an improved safety latch for books offthe Moody-and Du-Bois type.

. lever which can noobecome entangled in the hand of anoperatorif thebook should fail to swivel properly. I 7

Another object is to provide a locking arm cally when a bail is insertedinto the hook socket.

. Another object is to provide an improved housing construction for aspring swivel hook.;

Other objects and advantages will be seen from the folding descriptionand drawing.

Figure 1 is a vertical elevation, partly in cross section, of one formof my invention showing the hook in the closed position. I Figure 2 is;a vertical elevation. partly in cross section of a hook similar to thatshown Figture l, but provided with a spring for supporting the loadresiliently. The hook is shown in the open position.

" in Figure 1. I I

Like numerals indicate-like parts in the various figures.

having a shank portion I; a hody portion; and a.

locking arm is is piyoted'intermediate its ends in the slot 1 l asindicated at Ill. The outer end of locking arm i3 is provided withlateral lugs ..forming a T shaped headl'l; The inner end of ed to beengaged by a bail. indicatedin dotted lines at 20 to move thelocking armto the closed position when; a loadis i-mposed thereon. To insure that,the lockingarm will be fully closed surface of the bill 5 gsee Fig. 1).'The lower 6 side'of tall 119 is provided with a downwardly ReissuePatent No. 16,6l3-, issued May 3, 1927,10

W -.Th Another object is to'provide'a latch actuating which not onlyprevents a bail from jumping out released and will l e-closed and lockedautomati- Figure3 is a front elevation of the hook shown The hookcomprises a hookeshaped member bill portion 5, forming abail-receivingsocket l;

locking arm [3 comprises a. tail portion lfladapt even though the bail20 does not1seatsquare1y on the tail 13, said taillsprovided with araised portion 2! which extendsslightly above the top pressionspring 2housed in a recess 21 formed in the lower portion of the hill. 5. The"spring 2:5 norma1lyurges the locking army [3 to the open 'pcsltionshownin Fig.2. A stop 29 on the locking arm 13 engages a; shoulder .31inn-ill 5 to'limit. the opening movement of thelocking rectly above thepivotpin lli. Avertical slot as v hookmember '3 is provided on f-itsfront face with an inwardly extending pocket '33 diextendsdownwardlyfrom pocket. 33 through the body 3 "and vis adapted'to.receive the shank offthe locking arm t3. Thelower wall 3"! of the pocket'33 provides a shoulder against which the loweriaces of the'T head Mwill bear if theioad on the hook becomes large'enoughr A latch lever 33is positioned within thechannel I and is pivoted intermediate its endsto-[thebody 3 as-shown at it. The lower end. of the latch lever 39 isprovided with a cam face it adapted to engage acurved cam face 45 on thetail {9 when the locking arm 13' is inthe open position (Fig. 2) Thelatch lever iifl is provided neardts lower'end with a stop ll adapted toenag e the forward Wall of the channel-Tl to limit the-outward movementof the latch face it to a position flush with the inner faceof the bill-The upper end of the latch lever 39. is provided with ahand grip 49which extends outwardly K through the recess 9. Inward movement ofgthehead 49 is limited by a stop- 51 which engages the wall oi the shank I.A coil compression spring 53 is housed .in a pair of pockets Standv 57formed in-the shank and lever, respectively,

and: isadapted. to normally urge the latch lever to the locked position.The lower end .of the latch lever 3-9 is provided with adownwardlyfacing cam surface59 adaptedto coact with-an upwardly facing cam surfaceSt on tail is, so, positioned with respect to the pivot pin-4| that thepressure of the tail I9 in an opening direction tends to hold the lever39 more tightly in I the closed position. p v

d v To: release the locking arm t3 thealever head 49 is pushed towardthe shank 5 thus releasing the tail t9- trornthe latch lever 39',whereupon the spring moves the locking arm to to the open'position.shown in Fig. 2. Becauseghooks for use, on oil wells are subject tosevereshocks which. tend to open the latching means prematurely, andbecause such shocks are most-often in a verticaldirection, I post..- H

tionther'two springs 225 and: fit with their axes at substantially aright angle toeach other; with one spring in approximately a horizontalposi 1 tion. Since both of, these springs tend to'h'old the locking arminthe latched position (when closed) a blow or jar in either thevertical or horizontal plane (which might tend to'compress the otherspring. Inasmuch as the spring 53 is the one which isprincipally reliedupon to keep the latch locked, I prefer to place this spring in thehorizontal position. v

The upper portion of the shank I is provided with ,a circumferential rib53 which serves as a guard to protect the latch head 49 and the hand ofthe operator. Y

In the hook shown in Fig. l the upper end of the shank I is threaded asindicated at65 to re-- ceive a nut 61. A bail 69 and ball bearing IIsurround. theshank and are secured by the nut 61 which is locked to theshank by means of a crosspin 68. A washer I3 is interposed betweenthenut 61 andbearing II to serve as a cover plate to keep dirt out of thebearing. A lubricator for the bearing is indicated at 15.

The book shown in Fig. 2 differs from the hook shown in Fig. 1 in thatitis provided with a spring end of shank I and locked thereto by somesuitable means such as'the cross pin 85. The upper end of the shankextension BI carries a nut 81 which is locked thereto by means of across pin 89. A ball bearing 9| is interposed between the nut 81 and thetop of the springs and I9. I

The springs 11 and 19 are enclosed in and supported by a housing which,in the example shown, comprises an upper cylindrical member 93. and alower cylindrical member 95. The lower member 95 is provided with aninwardly extending flange 91 upon which the lower ends of springs 11 and19 are supported. Member 95 is also provided intermediate its ends withan outwardly extending flange 99. That portion of member 95 which isabove the flange 99 is threaded externally as indicatedat IOI, toreceive the threaded lower end of the upper cylindrical member 93,thelatter member seating upon the flange 99. The members 93 and 95 arelocked against relative rotation by means of a key I03 which is securedin place by a cotter pin I05. The key I03 is received in complementaryslots I04 and I06 formed in the upper and lower housing members,respectively. The lower slot I04 is open on its downward side. Thecotter pin I05 extends across this opening below the key I03 to keep thekey from falling out.

There is only one slot I04 in the lower housing, butthe upper housing isprovided with a'series of slots I06 arranged around the lower end of thehousing. a I I The upper end of housing member 93 is closed by a wallI0! which serves to keep water and dirt out of the spring housing andbearing. A lubri-' cant fitting I09 is provided in thehousingoppositethe upper position of the bearing 9 I. The upper end of thehousing member 93 is provided with a bail member I I I integraltherewith.

The foregoing description covers a preferred embodiment of-myinvention,but it is to be understood that the details of construction may bevaried within the scope of the appended claims.

I claim: I

1. In a hoistline hook'a body memberv forming a hook portion, a shankextending upwardly from said body, an enlarged head on the upper end of2,196,460 one of the springs) will not tend to compress said shank,ahousing surrounding said shank comprising an upper member and a lowermember detachably secured together, a bail integral with and extendingupwardly from the top of, said upper member, an annular inwardlyextending flange at the lower end of said lower housing member, a coilcompression spring interposed between said flange and said head andantifriction bearing means interposed between said shank thereof, saidlower housing member having at its lower end an-annular inwardlyextending flange, a coil compression spring interposed between saidflange and said head and antifriction bearing means intrposedbetween'said shank and hous 3. In a hoist line hook a body memberforming a hook portion, a shank extending upwardly from said body, anenlarged head on the upper end of said shank,ahousing surrounding saidshank comprising upper and, lower housing membersdetachably securedtogether, complementary registering slots in the threaded ends of saidhousing members, an opening from one of said slots for theinsertion of akey, a key inserted in said slots,

means for securing said key against accidental removal from said slots,a bail integral with and extending upwardly fromthe top of said upperhousing'member, an annular inwardly extending flange on the lower end ofsaid lower housing member, .a coil compression spring interposed betweensaid flange and said head and antifriction bearing means interposedbetween said shank and housing 4. A hoist line hook as defined in claim3 in which the upper housing member is provided with a plurality ofcircumferentially disposed slots adapted to selectively register withthe slot in said lower'housing member.

5. In a hoist line hook, a body member forming a hook portion, a shankextending upwardly from said body, an enlarged head on the upper end ofsaid shank, a coil compression spring'surrounding cient to accommodatesuspension means and in-' sufiicient to permit the insertion-of saidspring through the upperend of said upper housing section, and the lowerextremity of said upper housing section beingreadily detachablyflcomnectedto the upper extremity of said lower hous- I ing section, wherebysaid housing sections may be readily separated to afford access to theinterior of said housing.

Y RICHARD K. HER'IEL;

